This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI63X640S, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI63 Standard Cylinder SI63X640S
The AirTAC Airtac SI63 Standard Cylinder SI63X640S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 640mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI63X640S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke640 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI63X640S
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SI63 Standard Cylinder SI63X640S
The AirTAC SI63X640S is a discontinued double-acting ISO 15552 profile cylinder featuring a 63mm bore and 640mm stroke. It delivers 1559N push and 1402N pull at 0.5MPa through a G3/8 port. The direct replacement is the SAI63X640S, which preserves the exact bore, stroke, force, port, and mounting interface for seamless fixture integration.
Upgrading to the SAI brings an advanced two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line. For this magnet-equipped (-S) model, legacy CS1-B/DS1-B sensors apply, while the SAI uses current AirTAC switches.
Airtac SI63 Standard Cylinder SI63X640S Technical Specifications
| Model | Airtac SI63 Standard Cylinder SI63X640S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI63X640S |
| Bore size | Ø63 mm |
| Stroke | 640 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M16×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI63X640S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø63mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 kgf | |
The SAI63X640S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI63 Standard Cylinder SI63X640S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×640 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI63 Standard Cylinder SI63X640S Is Used
Pallet Diversion
Actuates diverter arms on packaging lines, utilizing the 1559N push force to redirect heavy goods at high throughput.
Material Lowering
Lowers stacked fixtures with a 79kg vertical lift capacity, requiring external guides to manage the 640mm stroke safely.
Storage Retrieval
Extends 640mm to extract totes from deep shelving, relying on the G3/8 port for rapid 30-800mm/s cycling.
Replacing the Airtac SI63 Standard Cylinder SI63X640S with the SAI63X640S
To replace the SI63X640S, order the SAI63X640S, confirming the ISO 15552 mounting interface, M16x1.5 rod thread, G3/8 port, and -S magnet. When sizing, neighboring bores offer alternatives: a 50mm bore yields 982N push, while an 80mm bore provides 2513N at 0.5MPa. Because this is a 640mm stroke, external guides are recommended to prevent rod bending and excessive side loads. A plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI63X640S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI63 Standard Cylinder SI63X640S FAQ
Yes, the SI63X640S is discontinued. The direct replacement is the AirTAC SAI63X640S. It is dimensionally interchangeable per ISO 15552, matching the 63mm bore, 640mm stroke, output force, G3/8 port, and mounting accessories.
The 63mm bore uses a G3/8 air port. Force output is 1559N push and 1402N pull at 0.5MPa, 2182N push at 0.7MPa, 2805N push at 0.9MPa, and a theoretical maximum of 318kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI63X640S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI63X640S replacement — usually within 7-8 hours.